Air-cell pipe covering



June 3, 1930. A. P; JURGENSEN AIR CELL PIPE COVERING 7 Original Filed Jan. 30, 1929 A Wald ATTORN EYS.

Patented June 3, i 1 930 71 5 ATES PATENT OFFICEM AUsUsrn JURGENsnN, or r"tIiIl DELPHIA,fPENNsYIQVANIA, ASSIGNOR r0 coNonN .rnro. AIR CELLS/AUTOMATIC. COMPANY, or PHILADELPHIA, PENNSYLVANIA, A

CORPORATION OF DELAWARE AIR-CELL rrrn COVERING qriginal application filed January 30, 1929, Serial N'o.

i .1929. Serial My invention relates to a new and useful air cell pipe covering for insulating steam pipes, fiues, exhaust pipes and the like, and it relates to a novel airv cell-pipejcovering which is inexpensive to produce, which'is' of a relatively great cross-sectional strength, and one which'is of a uniform 'cross-sectlonal thicknessthroughout, this application being.

a division of my copending application Serial No. 336,163, filed January30, 1928.

Air-cell pipetcoverings heretofore made have generallyconsisted of-a spiral cylindrical construction formed of a spirally wound or rolled continuous sheet of heat resisting material, which was diflicult and costly to make and which had inner and outer laps or joints, at the inner and outer ends of thespirally wound or rolled sheet. Furthermore, air-cell pipe coverings heretofore made have consisted of a continuous or. integral spirally formed cylinder whiclrwas cut axially or longitudinally after formation or completion to permit insertion thereinto,

I of the pipe to be insulated or covered.

A still further disadvantage resided in the fact that a spirally formed air cell. pipe covering wasnot of a uniform diameter or cross section, with a resultinginaccuracy inthe fit of said air cell pipe covering to the heating pipe to be insulated and covered thereby.

It is therefore the object of my invention tov produce a novel air cell pipe covering which is of uniform diameter and cross sectional thickness, and one which is formed initially axially split, with the edges thereof flush, contiguous, juxtaposed and in the same cylindrical plane, ,thereby' eliminating the objectionable laps and joints resulting from spiral formations above referred to. I

To the above ends my'novel air cell pipe covering consists of a plurality of sheets of heat resisting material of the same length but of gradually decreasing widths, with the widest of said sheets forming the outer circumference and the narrowest of said sheets forming the inner c1rcumference,said sheets being coated with an adhesive and moulded together in-concentric nested formation with '5 the longitudinal edges of said sheets, par- 336,1G3. Divided and this application filed July 23, No. 380,445. A

possesses other features of construction and advantage which will be hereinafter de scribed and claimed.

- For the purpose ofillustrating my invention I haveshown in the accompanying drawings forms thereof which are atpresent preferred by me although it is to be understood that the same are only illustrative ofthe nature of my invention andthat my invention is not limited to the precise con struction shown and described.

In the accompanying drawings I Figure 1, represents a perspective View of a composite blank form ofa plurality of sheets of corrugated heat resisting material and an inner canvas cover sheet from which my novel air-cell covering is formed.

V Figure 2,- represents a perspective view, of a sheet ofcorrugated heat resisting material shown coated with a heat resisting adhesive.

Figure 3, representsa fragmentary vertical sectional view illustrating the manner of moulding the composite blank shown in Figure 1.

Figure 4, represents a perspective View of the air cell pipe covering formed by moulding the blank shown in Fig. 1 by the mechanism shown in Fig. 3.

Figure 5, represents .a pair of the semi cylindrical sections shown in Figure 4 assembledto form a complete cylindrical air cell pipe covering. A

- Figure 6, represents a cross sectional view of a modified form of my novel air cell pipe covering;

Figures 7 and.8 illustrate the means and the. steps for forming the air pipe covering shown in Figure 6.

ing width, with the widest sheet 1. at the bot tom to form the outside circumference and Y the narrowest sheet 4 at top to form the inner circumference of the semi-cylindrical V clamped against the mould or core l2 on the' "core block 13 which is carried by the shaft 14 product when moulded. The sheets ltod'are by the rods thecams 10' p l to t and 6; formingthe composite blank are and'secu red in any desired position the nut 15, by means of the plunger 'l6carried bythef rod 17 which'carries t I the cam 19- fast entire-shah 1 1,which i s actrr-' ate'd byany suitable means not shown, The inoulds 7 are then raised into the position shown in the right hand side portion ofFig he roller; 18' 1iding onstrand-icy' lin d-rical' section '20 shown in Fig ure 4.-

By maki-ng the sheets a) 4 of' gradual l'y p and proportionallydecreasi ng widths, I produce a semi cylindjricalsection-20 having the;

fiat edges 21 which are composed of the-lon- V semi-cylindrical section '20 jand a binder fo t the edg esfl l'thereofl llwoof dissections-20 are clamped around a pipetobe insul atedin gitudinal edges of the sheetsl to l which are flush, parallelandinthe samehorizontal and cylindrical plane, with; the uppermost sheet 4 forming: the innercircumference andthe lowermostsheet 1 forniing 'the outer circumference of the section; The top cover layer 6 forms a lining for the innerjsurfa-c'e'the the niann'erillustr'atediniFigure In theri-ght handportion of right eff have illustrated the use of acom'pos'ite blank.

- tori-lied of twoslie'ets of'corrug atedypaperl the outside of the semi-cylindrical section 20 of my novel air cell pipe covering: 23 which;

ja'nd'Q i n lieu of the fou rfshow'n in Figure 1,

and I have'shown tlie inoul'ds 7 the clbsecl positionclainped against thein-ouldbr core 22 ofthecore' bleck 13.

It is to be understood that'pl ain orcor rug-atedpaper ma he used and that a com posite blank formed of any nuinber'ofsheets maybe eniployedt lt is further to 'be'noted that the cover 'layer' 6 may be duplicated on or may be entirely dispensed with'i'f desired. In Figure 6 Ilia've shown amodified' form consists of the sheets EZ L, 25, 26 andfi'fl, with or withoutthe cover l'ayer'tiyall of the. same length butrof gra'dua l l y decreasing'widths,

coated withanaidh 'sive 5 and arranged on a mould EZscarri ed by the plunger 29 which clain-ps thepyramidally arranged-shets24 to F ar-ag-ainstthecei-e or nandrelso ("see 'F-igure 1 the mould 28 being then closed' (see Figure l 8) by the rollers 31 on the rods 32 which are tat-mes actuated by 'cains similar to' those shown 75.11

Figure'B, to form the cylindrical air cell pipe g i 9:

covering 23 showiiinFigur-et; The cylindrical co-vering tinilieuof the sectional semicylindrioal'air pipe COverin L-QOryiS split at ,3 ['34 with the edges of; the sheets 24 to27juXta-s V posed, flush, and in the I sa ine cylindrical plane, and the product thus ohta ined is pe-r fectly cylindrical and has a uiii'fornr cross sectional thickness throughout It will thus be seen'that I have produced I a novel air cell pipe covering which is formed .m i ll-ysn t ori m ryl adris l t s 1 and the edges'of whichlare parallel, juxtae I posed and in thesa ne cylindrical'plane, 0 i

that iny' 'novel air cell pipe covering is en.-

tirel'y freefroin: theilaps and joiints due to the? spiral formation resulting from the winding 1 of; a c'ontinuous sheet, around a "mandrel; 7

which prevents perfect roun-olness' and =uni tawn ofcrosssectionalth cknesssince-"the would g; of several s'heets cutfto; the predetermined 81261 83111- eas er and quick;v

er operation than the windin'g of acontinuaccurate andiefli'cientxresults. r

By producing an initially. split cell V pipe covering, whether Jot the variety shown- In Figure c orinEFigu re 6 eliminate the op -It;is"-- further tobe noted that my novel 1 i i cell pipev comerijn 'is inexpensive to produce;

oussheet about a mandrel? and lll glVQS IHQI-Q eratirpn of cuttinga continuously formed spiral air cell 'prpe: cowerlngafter it is: formed 3 thus savingaiiim labe The inner j v canvas cover: or lining layer -6;;also' formsiai binder 'for 'theijuxtaposedl ecl gesof' the sheets rte-s formiuag the ed ges 21' of the seini cylim1q V l dricarl' setionQdtherehy imparting a neat" api of my noveliprodnct.

bodied other: sp'e cificwforms without departiing 'from 'thte spirit or essential attributes it i theifer)f "and *I ith'er'e-fore 'fdesire the presen-t i embodiment to. be coiisiyderedin an respects illustrative and not restrictive; reference beingliadtothe appended claiins rather than V i to the foregoi ng descriptionto-indicate th-e" scope-ofthe'invention;i

I Havin-g thus described iny invention, what ters Patent, is :1 Y

11; composite blank for forininglconcenfis 7 true air-cell"pipe coveringcomposedof a. plu 'ralityof, super mposed cemented sheets} of n5 I claim as new, and desirelto seollr'eby Leg. 5

heat insulating. material of the same; length but of graduallyldecreasing"widths, with the, widest of saidvshee'ts'f atfith'eihottoni and the; V

narrowest efisa'id sheets at the m nna a top cover sheet 'of approximately the amma-gel and width asth-e'wfdestof saidsheets. y

; frn air-cell pipe covering composedf of apl'urality of superimposed sheets of heat material. of the same l ntgth hut of I grad ually decreasing widths with the widest width as the lowermost of said sheets, said.

of said sheets at the bottom and the narrow-- est of said sheets at the top, and a top cover sheet of approximately the same length and cemented and moulded in concentric relation to each other to form a longitudinally split covering of cylindrical formation and of uni-V form cross section With the juxtaposed lon gitudinal edges of said sheets in the same plane.

AUGUST P. JURGENSEN. 

